I haven't listened to a lot of male Vocaloids, tbh.

literally the only guy in my top 5 is kaito

I listen to all of them. Sometimes I like to listen to the girls because they have a lot of good songs with deep meaning or just random funny or catchy songs.
And sometimes I like to listen to the males because their voices sound so hot xD
and I also love the shota's ;p

I mostly listen to female thought.

Here's my rank:

1. Kagamine Rin. Female.
2. Hatsune Miku. Female
3. Kagamine Len. Male.
4. Megurine Luka. Female.
5. GUMI. Female.
6. KAITO. Male.
7. MEIKO. Female

Not good enough to make it a mix, though.